A little printer / dispenser, built into the screen surround on your laptop or monitor.
Every now and then you find a yellow sticky note attached to the edge of your screen, where an advertiser has paid a premium to get an ad in front of you, by paying to activate the secret printer built into your screen.
No-one is ever told how the system works; the notes just appear occasionally, first thing in the morning.-- UnaBubba, Jan 15 2013 UnaBubba, Your mind should be sold for scientific discovery.-- Brian the Painter, Jan 15 2013 I just don't like yellow. May I get one with pink? [+]-- xandram, Jan 15 2013 This is funny. And cute, you cutie. +-- blissmiss, Jan 16 2013 You can have pink, [xandram]. Just for you.-- UnaBubba, Jan 16 2013 I like creating little mysteries like this. [+]-- AusCan531, Jan 16 2013 I thought of it as an alternative to the crappy "yellow post-it" software apps that people have started using.-- UnaBubba, Jan 16 2013 Periodically your display is going to need to be reloaded with a new set of post-its.
This will require some plausible excuse for service of your monitor, perhaps loading fresh pixels in it, or maybe you get periodic free upgrades to larger displays.-- normzone, Jan 16 2013 The free upgrade path would be the easiest way to maintain the deception.-- UnaBubba, Jan 16 2013 random, halfbakery